JP2020148904A5

JP2020148904A5 -

Info

Publication number: JP2020148904A5
Application number: JP2019046342A
Authority: JP
Filing date: 2019-03-13
Publication date: 2022-03-11
Anticipated expiration: 2039-03-13

Description

上記課題を解決するために、本発明に係る画像形成装置は、
シートが積載される積載部と、
前記積載部に積載された前記シートを給送するピックアップローラと、
前記ピックアップローラによって給送されたシートを搬送する第１搬送ローラと、
前記シートが搬送される搬送方向において前記第１搬送ローラよりも下流側の画像形成位置において前記シートに画像を転写する転写部と、
前記第１搬送ローラを回転駆動するモータと、
前記モータの回転子にかかる負荷トルクに対応するパラメータの値を決定する決定手段と、
前記決定手段によって決定された前記パラメータの値が所定値よりも小さい値から前記所定値よりも大きい値に変化した第１タイミングにおける前記シートの先端の位置と前記第１搬送ローラのニップ位置との間の長さと、前記第１搬送ローラのニップ位置と前記搬送方向において前記第１搬送ローラよりも下流側且つ前記画像形成位置よりも上流側の所定位置との間の長さと、に基づいて、前記第１搬送ローラによって所定速度で搬送されているシートを前記所定位置まで搬送する搬送速度を調整する調整手段と、
を有することを特徴とする。 In order to solve the above problems, the image forming apparatus according to the present invention is used.
The loading section where the seats are loaded and
A pickup roller that feeds the sheet loaded on the loading unit, and
A first transport roller that transports the sheet fed by the pickup roller, and
A transfer unit that transfers an image to the sheet at an image forming position downstream of the first transfer roller in the transfer direction in which the sheet is conveyed.
A motor that rotationally drives the first transfer roller, and
Determining means for determining the value of the parameter corresponding to the load torque applied to the rotor of the motor, and
The position of the tip of the sheet and the nip position of the first transport roller at the first timing when the value of the parameter determined by the determination means changes from a value smaller than the predetermined value to a value larger than the predetermined value. Based on the length between the nip position of the first transport roller and a predetermined position downstream of the first transport roller and upstream of the image forming position in the transport direction, An adjusting means for adjusting the transport speed for transporting the sheet transported at a predetermined speed by the first transport roller to the predetermined position, and
It is characterized by having.

Claims

The loading section where the seats are loaded and
A pickup roller that feeds the sheet loaded on the loading unit, and
A first transport roller that transports the sheet fed by the pickup roller, and
A transfer unit that transfers an image to the sheet at an image forming position downstream of the first transfer roller in the transfer direction in which the sheet is conveyed.
A motor that rotationally drives the first transfer roller, and
Determining means for determining the value of the parameter corresponding to the load torque applied to the rotor of the motor, and
The position of the tip of the sheet and the nip position of the first transport roller at the first timing when the value of the parameter determined by the determination means changes from a value smaller than the predetermined value to a value larger than the predetermined value. Based on the length between the nip position of the first transport roller and a predetermined position downstream of the first transport roller and upstream of the image forming position in the transport direction, An adjusting means for adjusting the transport speed for transporting the sheet transported at a predetermined speed by the first transport roller to the predetermined position, and
An image forming apparatus characterized by having.

The image forming apparatus has an acquisition means for acquiring information regarding the type of sheet to be conveyed.
The image forming apparatus according to claim 1, wherein the adjusting means adjusts the transport speed based on the information acquired by the acquiring means.

When the basis weight of the sheet to be conveyed is the first basis weight, the adjusting means sets a first length as a length between the position of the tip of the sheet and the position of the nip at the first timing. When the basis weight of the sheet to be conveyed is a second basis weight larger than the first basis weight, the position of the tip of the sheet and the position of the nip at the first timing are adjusted. The image forming apparatus according to claim 1 or 2, wherein the transport speed is adjusted by using a second length longer than the first length as a length between and.

The loading section where the seats are loaded and
A pickup roller that feeds the sheet loaded on the loading unit, and
A first transport roller that transports the sheet fed by the pickup roller, and
A transfer unit that transfers an image to the sheet at an image forming position downstream of the first transfer roller in the transfer direction in which the sheet is conveyed.
A motor that rotationally drives the first transfer roller, and
Determining means for determining the value of the parameter corresponding to the load torque applied to the rotor of the motor, and
An acquisition method for acquiring information on the basis weight of the sheet to be transported,
The sheet conveyed at a predetermined speed by the first transfer roller in response to the change in the value of the parameter determined by the determination means from a value smaller than the predetermined value to a value larger than the predetermined value. An adjusting means for adjusting the transport speed for transporting to a predetermined position on the downstream side of the first transport roller and upstream of the image forming position in the transport direction.
Have,
When the acquisition means acquires that the basis weight of the sheet to be conveyed is the first basis weight, the adjusting means adjusts the transfer speed to the first speed, and the basis weight of the sheet to be conveyed is increased. When the acquisition means acquires that the second basis weight is larger than the first basis weight, the transport speed is adjusted to a second speed higher than the first speed. Image forming device.

The image forming apparatus is
A second transport roller provided on the upstream side of the image forming position and on the downstream side of the first transport roller in the transport direction.
An abutting member provided on the upstream side of the image forming position and on the downstream side of the second transport roller in the transport direction and with which the tip of the sheet transported by the second transport roller abuts.
Have,
When the tip of the sheet comes into contact with the contact member, the skew of the sheet is corrected.
The image forming apparatus according to any one of claims 1 to 4, wherein the predetermined position is a position between the first transfer roller and the second transfer roller.

The image forming apparatus has a control means for starting and stopping the rotational drive of the pickup roller at predetermined time intervals.
The adjusting means includes a time from the third timing at which the rotational drive of the pickup roller is started to the second timing at which the seat should reach the predetermined position, a time from the third timing to the first timing, and the above. A claim characterized in that the transport speed is adjusted based on the length between the position of the tip of the sheet and the nip position in the first timing and the length between the nip position and the predetermined position. Item 6. The image forming apparatus according to any one of Items 1 to 5.

The image forming apparatus is
A rocking member that raises and lowers the pickup roller that is driven to rotate,
A control means for controlling the ascending / descending operation of the rocking member, and
Have,
The adjusting means includes a time from the third timing at which the rotational drive of the pickup roller is started to the second timing at which the seat should reach the predetermined position, a time from the third timing to the first timing, and the above. A claim characterized in that the transport speed is adjusted based on the length between the position of the tip of the sheet and the nip position in the first timing and the length between the nip position and the predetermined position. Item 6. The image forming apparatus according to any one of Items 1 to 5.

The image forming apparatus has a feeding roller provided on the upstream side of the first transport roller in the transport direction and transports the sheet fed by the pickup roller downstream.
The image according to any one of claims 1 to 7, wherein the transport path provided between the feed roller and the first transport roller to which the sheet is guided is curved. Forming device.

The feeding roller is adjacent to the first transport roller.
The image forming apparatus according to claim 8, wherein the peripheral speed of the first transport roller is faster than the peripheral speed of the feed roller.

One of claims 1 to 9 , wherein when the value of the parameter determined by the determination means is smaller than the predetermined value for a predetermined time, the transfer of the sheet is stopped. The image forming apparatus according to.

The image forming apparatus is
A second determining means for determining the rotation phase of the rotor of the motor,
A second control means for controlling the drive current flowing through the winding of the motor so that the deviation between the rotation phase determined by the second determination means and the command phase representing the target phase of the rotor becomes small.
The image forming apparatus according to any one of claims 1 to 10, wherein the image forming apparatus has.

The second control means is a torque component that is a current component represented in a rotating coordinate system based on the rotation phase of the rotor determined by the second determination means and is a current component that generates torque in the rotor. The image forming apparatus according to claim 11, wherein the drive current is controlled based on a current component.

The image forming apparatus is
A second determining means for determining the rotational speed of the rotor of the motor,
A second control means for controlling the drive current flowing in the winding of the motor so that the deviation between the rotation speed determined by the second determination means and the command speed representing the target speed of the rotor becomes small.
The image forming apparatus according to any one of claims 1 to 10, wherein the image forming apparatus has.

The image forming apparatus has a third determining means for determining the rotation phase of the rotor of the motor.
The second control means is a torque component that is a current component represented in a rotating coordinate system based on the rotation phase of the rotor determined by the third determination means and is a current component that generates torque in the rotor. The image forming apparatus according to claim 13, wherein the drive current is controlled based on a current component.

The image forming apparatus has a detecting means for detecting a drive current flowing through the winding of the motor.
The image forming apparatus according to claim 12 , wherein the parameter is a value of the torque current component of the drive current detected by the detection means.

The image forming apparatus according to claim 12 , wherein the parameter is a target value of the torque current component.

The image forming apparatus according to any one of claims 1 to 14, wherein the parameter is the deviation.